Abstract
A resonance-like structure has been observed in the total cross section for the γd → ηnp reaction at E γ ∼ 1.02 GeV. The experiment was conducted at Laboratory of Nuclear Science, Tohoku University, by utilizing a tagged photon beam provided with an internal radiator in a 1.2 GeV electron synchrotron. A solid deuterium target was employed as well as a solid hydrogen target to extract information on the process γn → ηn. A clear bump has been observed in the total cross section for the γn’ → ηn reactio where n’ means a neutron in Fermi motion. A simple analysis gives the position of about 1670 MeV and the width of less than 40 MeV for the bump, respectively, taking into account the Fermi motion. There is no bump structure observed, in contrast, in the γp→ ηp process at the same energy region. The U-spin conservation may naturally account for this phenomenon, if the bump is an indication of a hidden-strangeness pentaquark baryon N 5(1670) in the anti-decuplet state.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
T. Nakano et al. (LEPS Collaboration), Phys. Rev. Lett. 91, (2003) 012002.
V. V. Barmin et al. (DIANA Collaboration), Phys. At. Nucl. 66, (2003) 1715; S. Stepanyan et al. (CLAS Collaboration), Phys. Rev. Lett. 91, (2003) 252001; J. Barth et al. (SAPHIR Collaboration), Phys. Lett. B572, (2003) 127; A. Airapetian et al. (HERMES Collaboration), Phys. Lett. B585, (2003) 213; A. Aktas et al. (H1 Collaboration), Phys. Lett. B588, (2004) 17; S. Chekanov et al. (ZEUS Collaboration), Phys. Lett. B591, (2004) 7; M. Abdel-Bary et al. (COSY-TOF Collaboration), Phys. Lett. B595, (2004) 127; A. Aleev et al. (SVD Collaboration), Phys. At. Nucl. 68, (2005) 974.
J. Z. Bai et al. (BES Collaboration), Phys. Rev. D70, (2004) 012004; I. Abt et al. (HERA-B Collaboration), Phys. Rev. Lett. 93, (2004) 212003. S. Schael et al. (ALEPH Collaboration), Phys. Lett. B599, (2004) 1; C. Pinkenburg et al. (PHENIX Collaboration), J. Phys. G: Nucl. Part. Phys. 30, (2004) S1201; R. Mizuk et al. (Belle Collaboration), Phys. Lett. B632, (2006) 173
M. Abdel-Bary et al. (COSY-TOF Collaboration), hepex/0612048.
B. McKinnon et al. (CLAS Collaboration), Phys. Rev. Lett. 96, (2006) 212001.
T. Nakano, talk at INPC07.
V. V. Barmin et al. (DIANA Collaboration), Phys. At. Nucl. 70, (2007) 35.
A. Aktas et al. (H1 Collaboration), Phys. Lett. B639, (2006) 202; J.M. Link et al. (FOCUS Collaboration), Phys. Lett. B639, (2006) 604.
K. Karliner and H.J. Lipkin, Phys. Lett. B597, (2004) 309; Ya. Azimov, K. Goeke, and I. Strakovsky, hepph/0708.2675.
D. Diakonov and V. Petrov, Phys. Rev. D69, (2004) 094011.
R. A. Arndt et al., Phys. Rev. C69, (2004) 035208.
H. C. Kim et al., Phys. Rev. D71, (2005) 094023.
V. Kuznetsov et al. (GRAAL Collaboration), hepex/0606065.
T. Nakabayashi et al., Phys. Rev. C74, (2006) 035202.
W. T. Chiang et al., Nucl. Phys. A700, (2002) 429.
B. Krusche et al., Phys. Rev. Lett. 74, (1995) 3736; F. Renard et al. (GRAAL Collaboration), Phys. Lett. B528, (2002) 215; M. Duggaer et al. (CLAS Collaboration), Phys. Rev. Lett. 89, (2002) 222002; V. Crede et al. (CB-ELSA Collaboration), Phys. Rev. Lett. 94, (2005) 012004.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2008 Società Italiana di Fisica / Springer-Verlag
About this paper
Cite this paper
Shimizu, H. et al. (2008). N* (1670) observed at LNS, Sendai. In: Hammer, HW., Kleber, V., Thoma, U., Schmieden, H. (eds) NSTAR 2007. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85144-8_12
Download citation
DOI: https://doi.org/10.1007/978-3-540-85144-8_12
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-85143-1
Online ISBN: 978-3-540-85144-8
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)